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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b6478082f9e2c716003266f8f7ef3b77a8763216342b2532a1a2405a2e550d6' 
  AND token = 'RlUkVIDvzQf+rF7A+sSlDutXHFpfodR2gnveYjPyFeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}